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Shanice LeitchAdnan AlkurdiTurturica GabrielCrigler Najjar喇杰 Recent comment authors
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Shanice Leitch
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Shanice Leitch

DrPhysicsA, CT means Computerized axial Tomography right?or does Computed Tomography mean the same?

k roninson
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k roninson

Wait a minute! Is he saying roughly that the image is created using a matrix?

Ely Dex
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Ely Dex

This was really helpful. Thanks!

Usman shakeel
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Usman shakeel

im not getting perfectly that why you divided by 3???

Hanaa Ramjaun
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Hanaa Ramjaun

i just did this today at school.thank you soo much i understand it way better now!
keep up the good work,you got another sub 🙂

Vivek Maharana
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Vivek Maharana

Awesome one

Ciaran Polglase
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Ciaran Polglase

i didn't follow that at all, you explained it well, i must just be dumb.

Iris Brouwer
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Iris Brouwer

Thank you so much for making this video, it wasn't completely clear to me before but now I fully understand!

DWYS WYSD
Guest
DWYS WYSD

What kind of computer of processor would a CT scanner use to add all this up? So much computation needed for just one voxel, insane !

shoaib salman
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shoaib salman

hats off!

cutiee pie
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cutiee pie

y u no longer make videos u have soo many subscribers

spottymaldoon
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spottymaldoon

What a very clever presentation – so often they are fudged and nobody, maybe including the presenter, comes out understanding. Thank you for this – and well done!

Thiru vasagam
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Thiru vasagam

thank you for these information

Adnan Alkurdi
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Adnan Alkurdi

is he washing ? or is it a blender?

Turturica Gabriel
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Turturica Gabriel

What is the name of this method ?

Crigler Najjar
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Crigler Najjar

Dota 2 logo, anyone?

喇杰
Guest
喇杰

by the way, are you boiling water when you were doing the video?

Chifaaa Chelly
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Chifaaa Chelly

What is a voxel? I need a scientific definition plz.

Limitless 1
Guest
Limitless 1

wow so ct is using x ray
and it builds a 3d image
that is so interesting
thanks !

Mohammad Masroor
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Mohammad Masroor

thanks a loooooooot, sir! you r a life saver

Tudor Popescu
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Tudor Popescu

This explanation is simply the best one i have seen. you're doing a great job in explaining all these things. you are truly a life-saver

Silver Reyes
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Silver Reyes

at 10:07 do we just divide by a common factor; such as for the this example the common factor was 3?

mario caruana
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mario caruana

Thanks

Anonymous
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Anonymous

Are yu Fuking riding a plane?

Anonymous
Guest
Anonymous

Mentally Fucked

Photosounder
Guest
Photosounder

Doing an offset (subtracting 16) at the end is actually here a way of doing a high pass filter. Since there are only two possible frequencies for each axis, then subtracting lowers DC (frequency 0) which makes the other frequency (nyquist) relatively higher. Only works in this particular case.

One in a billion
Guest
One in a billion

Hi, one of the question mentioned "background reading". May I know what that is?

XIANG YU
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XIANG YU

The algorithm is fantastic! Thanks for explaining this!

Zakir Ullah
Guest
Zakir Ullah

Great! explained very well. Thanks

Patrick Tan
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Patrick Tan

Why is the background reading the sum of attenuation for one scan??? And why is everything divided by 3 in the final step?????

Rory Lion
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Rory Lion

What kind of brain comes up with this……makes me feel stupid….well done chaps. You both earned your 1979 Noble prizes

Andre Bolle
Guest
Andre Bolle

How does this scale from a 2 by 2 to an N by N grid?

GoldCobra/ Arima
Guest
GoldCobra/ Arima

Who came up with that algorithm?! And why?

Prathamesh Mandke
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Prathamesh Mandke

Hey,

Thanks for the clear and concise explanation.

I have 2 queries.

1. Are the computed voxel values directly interpretated as image pixel intensities which is what we see as the CT image?
2. As per my understanding, the detector will record the intensities of the received beam whereas the numbers that you mention in the voxel's are attenuation coefficients. So, more the attenuation coefficient or a voxel lesser will be the intensity recorded. What exactly do the summed values 7, 9, etc. represent? Are they the attenuation coefficients or the intensities recorded by the detector?

Thanks in advance!

Gajan
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Gajan

thank you

csy_ 2004
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csy_ 2004

I finally understand why my physics lecturer is a pure rubbish after watching this 👍

madhan kumar
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madhan kumar

Wow

Samira Mirzapour
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Samira Mirzapour

awesome

Sowmya Banerjee
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Sowmya Banerjee

Thank you! Great revision video. ^_^

George Eaton
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George Eaton

THANK YOU SO MUCH!

Daniel Fragoso
Guest
Daniel Fragoso

Hello thank you! And how is the final results of the matrix transformed in an image like the black pages the laboratories give you as fault ? Thank you

Zahid Dar
Guest
Zahid Dar

very helpful
Sir can u please make a video about iterative reconstruction

Frank A Moscatelli
Guest
Frank A Moscatelli

Very nice description. But I think you need to emphasize that you solver the forward problem. That is, given the voxel absorption values, find the absorptions of the 4 beams. Actually going into hospital and getting a CT scan and reconstructing the voxel values from it is the inverse problem. Is the inverse solution unique? Often they are not.

Thanidu Nawanjana
Guest
Thanidu Nawanjana

After all these years, it helped me to clear my doubts. Thank you!

Ramesh Suthar
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Ramesh Suthar

Well…. If I take a 3by 3 box then from how many angles I need to project??? Plz reply… Is there any formula for that..?

Eric Davies
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Eric Davies

I'm puzzled by the apparent additive nature of the voxels rather than multiplicative. If I shine a light through a two filters that individually block out 50% of the light, I'd expect that combining the two would block out 1 – .5*.5 = 75% of the light, not 100%. Do XRays operate differently, or is the percentage of X rays blocked so small that using addition is an acceptable approximation for multiplication?

Alex M
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Alex M

What do you call this kind of CT reconstruction?? Because we have different kinds of CT reconstruction – Back projection, Iterative, and Analytic Method. What is this kind?